Abstract
Lg waves are a complicated high-frequency seismic signal and have been considered as strongly scattered higher modes of surface waves with group velocities around 3.5 km/s (Press and Ewing, 1957; Knopoff et al. 1973; Kennett, 1986; Xie and Lay, 1994). The stability of the RMS amplitude of Lg waves was demonstrated by Hansen et al. (1990) and others in the analyses of regional seismograms produced by nuclear explosions and earthquakes. Since Lg waves effectively average both the source radiation patterns and many effects of crustal structure along a particular path, RMS amplitude of Lg waves can be used to determine the source size once the attenuation of Lg along the path is determined.
Published Version
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